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Retirement Benefits | 3 Months Ended
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Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Note 7. Retirement Benefits The components of the net periodic pension benefit costs for the three months ended March 31 were as follows:
| 2014 |  | 2013
| (Dollars in thousands)
Service cost | $ | 3,455 |  |  | $ | 4,110 |
Interest cost | 7,430 |  |  | 6,648 |
Expected return on plan assets | (14,355 | ) |  | (13,114 | )
Amortization of prior service cost | 285 |  |  | 428 |
Amortization of actuarial losses | 217 |  |  | 2,987 |
Net periodic benefit (credit) cost | $ | (2,968 | ) |  | $ | 1,059 |
The components of the net periodic other postretirement benefits costs for the three months ended March 31 were as follows:
| 2014 |  | 2013
| (Dollars in thousands)
Service cost | $ | 138 |  |  | $ | 201 |
Interest cost | 408 |  |  | 474 |
Amortization of prior service credit | (714 | ) |  | (669 | )
Amortization of actuarial (gains) losses | (85 | ) |  | 54 |
Net periodic benefit (credit) cost | $ | (253 | ) |  | $ | 60 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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